You will never know.

It has dawn on me that it has ended, what have a beginning also have an end, so when you experience such a thing in life, just know it happens and no one can stop it so no matter where you find yourself know it is life.

It happens to me so it can happen to you also, don't let pride hold you, just be grateful for what you have and thank God for what you lost. Everything happens for a particular reason.